Engine valve gear



l. D. HOOD.

ENGINE VALVE GEAR. APPLICATION FILED JCT. 6. 1919.

' 1,414,739. Patented May 2,1922.-

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ENGINE VALVE GEAR.

APPLICATlON FILED OCT. 6,1919.

1,414,739. Patentedmayzwzz.

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ENGINE VALVE GEAR. APPLIQAIION FILED OCT. 6. 1019.

Patented May 2, 1922.

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lowing to be a full, clear, and exact description of the invention, suchas will enable others skilled in the art to which it appertains to makeand use the same.

My inventionrelates to improvements in engine valve gears and thepresent embodiment thereof is shown in connection with a locomotive,although it is intended that it shall be used to equal advantage onother forms of steam engines.

' The principal object of my invention is to provide a valve gearsimplifying, cheapening and generally improving prior devices, and withthis in view, the invention resides in the novel construction andarrangement of parts hereinafter described and claimed, the descriptivematter beingsupplemented by the accompanying drawings.

Figure 1 is a side elevation of a valve gear constructed in accordancewith my invention.

Fig. 2 is a top plan view of the parts shown in Fig. 1.

Fig. 3 is a plan view of the horizontal lever-which is'actuated from thepitman, showing the suspending link of this lever and'the verticaloperating lever in horizontal section.

Figures 4 and 5 are side elevations with parts in section showing themechanism set for forward driving and reversing, respectively.

In the drawings above briefly described, the numerals 1 and 2 designaterespectively the cylinder and steam chest of a locomotive, 3 hasreference to the crosshead, 4 refers to the piston rod, 5 indicates thepitman and 6 designates the stem which operates the usual slide valve(not shown) within the steam chest 2. All of these parts are of theusual or any suitable construction and form no part of my inventionexcept in connection with the parts hereinafter pointed out.

A bracket or other suitable support 7 is provided for a verticalsuspending link 8, the upper end of said link being by preference forkedat 9 to straddle said bracket, to which it is suitably pivoted at 10.The lower end of link 8 is forked at 9 and is Specification of LettersPatent.

Application filed October 6, 1919. Serial No. 328,693.

Patented May 2,1922.

fulcrumed to a horizontal lever ll between j theends of the latter,-therear end of said horizontal lever being pivoted at 12 tothe pitman 5while the front end of said lever is pivotally connected at 13 to thelower forked end14 of the vertical operating lever 14. r

The upper end of lever 14 is forked at 14 and fulcrumed at 16 to a pairof substantially horizontal links 17 which are pivoted at 18 to crankarms 19 on the usual'transverse rock shaft 20.

This rock shaft is connected by suitable means such as the crank arm 21and rod 22 with the usual reverse lever (not shown). At 23, the rear endof the valve operating radius rod 24 is pivoted to the lever 14 betweenthe fork arms and a short distance below the fulcrum 16, the front endof said link 24 being pivoted to the valve stem 6.

In operation, the pitman 5 swings the lever 11 upon its fulcrum l5 andat the same time moves said lever forwardly and rearwardly, during whichmovement the suspending link 8 .swings in the necessary manner. The

tuating the usual slide valve. The movement of this valve may becontrolled in the usual way by adjusting the rod 22 and reversing mayalso be effected by shifting said rod in the-proper manner. (See Fig.5.)

The principal improvements which I have made over the prior art, are inmounting the horizontal lever 11 upon a swinging link and in pivotingthe rear end of said lever directly to the-pitman rather than to a slideon said pitman. These changes greatly simplify and cheapen previousstructures without decreasing their advantages in any manner whatsoever.

' Since probably the best results are obtained from the detailsdisclosed, they may well be followed, but within the scope of theinvention as claimed, minor changes may be made and obviously the valvegear may be employed on numerous forms of steam engines, although thepresent disclosure is directed toa locomotive valve gear.

I claim: In a steam engine valve gear, the combination with a slidevalve rod, a piston rod below said valve rod a pitman pivoted to saidpiston rod, and a relatively fixed frame,

structure; of a vertical link pivoted at its upper end to said framestructure in a plane above said valve rod, the lower end of said linkbeing in substantially the same plane as Saidpitmanand spaced outwardlyfrom the latter, a substantially horizontal. lever fulcruined betweenits ends to the lower end of said; link, the rear end of said.leverbeing offset inwardly and pivoted directly to said pitman whilethefront end of said lever is offset outwardly, a, substantiallyverticallever parallel with and spaced forwardly from said verticallink, a pivot connecting the lower end of said vertical lever with thefront end of' said horizontal lever, a sub stantially horizontal linkpivoted at its rear 7 end to the upper end of said "ertical lever Intestimonyv whereof I have hereunto set 25 my hand.

JOHN D. Hoonl

